Pharmaceutical Hammer Mill
High-Energy Impact Milling Down to 30 Microns. Frewitt HM, HW, and MFH Series.
Overview
Frewitt’s hammer mills use high-speed rotor impact to reduce particles from 10 mm input down to 30 microns. The high rotor speed delivers rapid size reduction with low energy input and minimal temperature increase, which matters for heat-sensitive APIs and excipients that degrade under friction.
Three tiers cover lab through heavy production. The EasyMill HM-3 and HM-6 are compact production units (700 and 2,000 kg/h respectively) with simple button-and-display controls, GMP/EHEDG compliance, and a mobile stand for repositioning between suites. The FlexMill HW-3 and HW-6 are the same hammer mill heads on the premium FlexMill platform, adding automatic head detection, touchscreen HMI, and 21 CFR Part 11 data integrity. At the top end, the PowerMill MFH-15 handles up to 5,000 kg/h with OEB 5 containment and processes dry, wet, and very hard materials.
All hammer mill heads mount on Frewitt’s shared platform architecture alongside conical sieve, oscillating, and rotary sifter heads. A facility already running Frewitt conical mills can add hammer milling capability by purchasing a head, not a second machine.
Lab-scale development starts on the FlexMill Lab platform, which includes an HM-1 hammer mill head alongside five other milling processes. Process parameters established at lab scale carry forward to the production HW and HM heads using the same milling geometry.
Key Specifications
| Input Size | Up to 10 mm (HM/HW) or 2 cm (MFH-15) |
| Output Size | Down to 30 µm |
| Throughput (HM-3 / HW-3) | Up to 700 kg/h |
| Throughput (HM-6 / HW-6) | Up to 2,000 kg/h |
| Throughput (MFH-15) | Up to 5,000 kg/h |
| Temperature Range | -20 °C to +60 °C |
| Containment (MFH-15) | OEB 5 capable (< 1 µg/m³) |
| ATEX | Zone 0/20 (optional on HM/HW, standard on MFH-15) |
| Construction | AISI 316/316L interior, Ra ≤ 0.8 µm |
| Weight (HM-3/HM-6) | 160 / 200 kg |
Key Features
Low Heat Generation
High rotor speed delivers rapid milling with minimal energy input and temperature increase. Preserves heat-sensitive APIs and excipients that degrade under prolonged friction in slower mills.
Platform Compatibility
Hammer mill heads mount on the same base unit as conical sieve, oscillating, and rotary sifter heads. Add hammer milling to an existing Frewitt line without a separate machine or footprint.
OEB 5 Containment
The MFH-15 achieves operator exposure below 1 µg/m³ for processing potent compounds. ATEX Zone 0/20 classification available across the range for explosion-hazard environments.
Dry, Wet, and Hard Materials
The MFH-15 handles dry powders, wet products, and very hard materials in the same machine. Unusual versatility for a pharmaceutical hammer mill.
Simple or Advanced Controls
EasyMill HM models use buttons and digital display for straightforward operation. FlexMill HW models add touchscreen HMI with automatic head detection and 21 CFR Part 11 data integrity.
Compact and Mobile
EasyMill HM units weigh 160 to 200 kg on a mobile stand. Reposition between production suites without rigging. The FreLift lifting column option handles height adjustment for integration with upstream and downstream equipment.
Models
| HM-1 (Lab) | Lab-scale hammer mill head on the FlexMill Lab platform. Process development and formulation screening. |
| HM-3 / HW-3 | Production hammer mill. Up to 700 kg/h. EasyMill (HM-3) or FlexMill (HW-3) platform. |
| HM-6 / HW-6 | Production hammer mill. Up to 2,000 kg/h. EasyMill (HM-6) or FlexMill (HW-6) platform. Dimensions: 1,320 x 668 x 1,050 mm. |
| MFH-15 | Heavy-duty PowerMill hammer mill. Up to 5,000 kg/h. OEB 5, ATEX Zone 0/20. Handles dry, wet, and very hard materials. Standalone, inline, or plant-integrated. |
Applications
- Size reduction of pharmaceutical granulates, tablets, and intermediates
- Fine milling of excipients and APIs down to 30 microns
- High-volume production milling up to 5,000 kg/h
- Processing heat-sensitive compounds requiring low-temperature milling
- High-potency compound milling with OEB 5 containment
- Wet milling and processing of very hard materials (MFH-15)
- Inline integration between dryers, blenders, and downstream equipment
Options
- ATEX Zone 0/20 certification
- WIP and SIP cleaning systems
- Volumetric dosing device
- FreLift mobile lifting column
- Active inerting and O₂ monitoring
- 21 CFR Part 11 / GAMP 5 compliance (FlexMill HW platform)
- Level, pressure, and temperature sensors
MHS Pharma. Northeast US Representative for Frewitt.
MHS Pharma provides direct technical representation for Frewitt across the Northeast United States. Contact us to discuss hammer milling for your application.
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